Flue pipe



Patented Nev.

ALBERT II. TINNERMAN, F CLEVELAND, OHIO.

FLUE PIPE.

Application filed February This invention is concerned with fine con structions and is directed more particularly to metallic flue pipes.

I "1 I o ect of my invention 18 the ne general oh; provision of a flue pipe construction which may be tubularly formed of sheet metal in the customary manner but which embodies structural characteristics directed to preserving the Shane of the flue pipe sections 3 l when subjected to extreme heat whereby the flue pipe sections may be coated with a vitrified enamel.

Stoves for domestic use, such ranges, etc, are now constructed manner that all of the exterior or exposed surfaces thereof can be finished with a. vitreous washable enamel and are usually finished with a white enamel to meet the popular demand of the trade. lllflorts have been made to coat flue sections or pipe sec tions of the stove with a vitreous enamel corresponding to the color of the stove.

Owing to the character of the construction of the usual flue pipe sect-ion, the metal would warp curing the burning step of the enamel coating process and when attempts were made to match or fit abutting ends of such treated pipe sections, the enamel would crack when the body of the pipe sections were sprung to bring about such fitting.

My present invention therefore contemplates the use of sheet metal of no greater thickness than the usual sheet metal in flue pipe sections, but I provide flanged ends to reinforce and preserve the cylindrical shape of the sections during the burning process. I also provide a novel means for interiorly engaging the ends of the pipe sections whereby such means may be completely obscured while eifectively connecting and maintaining the interengaging sections in proper abutment and circumferential alignment.

Other objects of my invention will hereinafter he set forth in the following description referring to the drawings which illustrate a preferred form thereof. The essential characteristics are summarized in the claims.

In the drawings, Fig. 1 is an elevation of two joined sections of flue pipe broken away at their abutting ends to illustrate the joining means; Fig. 2 is a fragmentary crosssectional view of the abutting ends of the sections showing the manner of assembling the section joining means; Fig. 3 is aplan as gas in such 28, 1925. Serial No. 12,353.

view of the sectional joining means; Fig. l is an enlarged fragmentary cross-sectional view of the end of the pipe section and the joining means in assembled relation and Fig. 5 is a modified form of joining means.

In Fig. 1, I show two sections of cylindrical flue pipe formed of sheet metal. These sections are reinforced at the ends preferably by inwardly flanged portions 11 which may be formed when the sheet metal is being formed into a cylinder. These an nular flanges may extend inwardly a substantial distance whereby when the sections are placed in abutting relation a proper annular contacting surface therebetween will be provided. These flanges may be formed also to afford a gripping surface for a joining or clamping means which is adapted to be disposed interiorly of the flue, whereby only the usual exterior annular seam will be exposed to view. 1

The means for engaging the abutting ends of the flanged pipe sections may be embodied in a variety of forms. A simple means for engaging the ends of the pipe sections which is also effective in maintaining the sections in closed and aligned relation may comprise a split ring structure formed of spring metal. As shown in Fig. 3 the split, grooved ring 12 may be provided with coniformed flanges 15, flaring from a central annular groove 16, the width of the groove being proportioned to be slightly less than the combined thickness of the abutting flanges 11 of the pipe sections 10. The tapering flanges on the ring serve to facilitate the positioning of the ring when forced longitudinally of the pipe sections to bring the groove 16 thereof in annular alignment with the flanges of the sections. When the ring is positioned as shown in Fig. 2 and pressure is applied to one end thereof, it will be circumferentially contracted as shown by the dot and dash lines in Fig. 8 thus permitting it to be slipped over the flanges until the groove is brought into alignment with the flanges 11 of the sections. The ring may then expand whereupon the rounded circumferential edges 14 will slip over the flange surfaces and into contact with the circumferential Walls of the pipe sections thus tending to align the pipe sections as well as to grip the flanges and clamp the sections together.

A modified form of joinin means may comprise a pressed metal mem er such as is shown'in Fig. fi 'ha'vin'g a plurality of spring fingers 18 flaring from a top portion 19. The ends of the fingers may be bent to provide flange clamping portions'2O and 2l which also serve to contact with the cylindrical walls of the pipe sections.

It will thus be seen that the pipe sections 10 may be provided with thevitre'ous coating 22 and the process of applying this vitreous coating which includes the application of heat to the pipe sections will not re sult in any warping of the section ends by reason of the fact that the radial flanges 11 serve to preserve the concentricity of the pipe sections.

It will also be apparent that by eliminating the necessity of telescoping the connecting ends of the pipe sections no occasion arises for exerting lateral pressure on the walls of the pipe sections and accordingly no circumstance arises in the assembly of the pipe sections which" would result in damage to the vitrified enamel surfaces thereof. Likewise it will be apparent that various means may be resorted to for connecting the reinforced or flanged ends of the pipe sections without departing from the spirit of my invention.

I claim:

l. Incoinbina-ti'on apair of abutting flue pipe sections having adjacent inturned flanges, a resilient split ring havin a portion thereof formed-into a depressed loop substantially coextensive with the ring, the loop" extending inwardly toward the axis of the pipe sections, one side of the loop haw ing a flange extending inwardly therefrom at an angle, the free edge of said flange being disposed inwardly of said flanges of the sections, whereby said ring may be forced along and within one of the flue sections and cammed over the section flanges to cause the looped portion to engage such flanges and hold the flue pipe sections together.

2. In combination with a pair of adjacent flue pipe sections having inwardly turned flanges, a resilient member having cam surfaces disposed inwardly toward the axis of the sections beyond the flue pipe flanges and having a loop integrally formed with the cam portion arranged to clampingly engage said flanges to hold them together, whereby said resilient member may be forced along a line pipe section and cammed into engagement with said flanges.

In testimony whereof, I hereunto ailix my signature. v

ALBERT n. TINNERMAN. 

